Stibiconite
Stibiconite is an antimony oxide mineral with formula: Sb3O6(OH). Its name originates from Greek "stibi" (antimony) and "konis" (powder), alluding to its composition and habit.[1][2][3] It is a member of the pyrochlore super group.
Stibiconite | |
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![]() Stibiconite. Locality: Catorce (Real de Catorce), Municipio de Catorce, San Luis Potosí, Mexico (Locality at mindat.org) | |
General | |
Category | Oxide minerals |
Formula (repeating unit) | Sb3+Sb5+2O6(OH) |
Strunz classification | 4.DH.20 |
Crystal system | Isometric |
Crystal class | Hexoctahedral (m3m) H-M symbol: (4/m 3 2/m) |
Space group | Fd3m |
Unit cell | a = 10.27 Å; Z = 8 |
Identification | |
Formula mass | 478.25 g/mol |
Color | Pale yellow to yellowish white, reddish white, orange; gray, brown, black when impure |
Crystal habit | Massive, botryoidal, as incrustations, powdery |
Cleavage | None |
Fracture | Clay-like |
Mohs scale hardness | 4-5 |
Luster | Vitreous - dull |
Streak | light yellow |
Diaphaneity | Transparent to translucent |
Specific gravity | 4.1 - 5.8, Average = 4.94 |
Optical properties | Isotropic |
Refractive index | n=1.6-1.97 |
References | [1][2][3] |
Discovery and occurrence
It was first described in 1862 for an occurrence in the Brandholz - Goldkronach District, Fichtelgebirge, Franconia, Bavaria.[2]
It occurs as a secondary alteration product of other hydrothermal antimony minerals such as stibnite. It occurs in association with cervantite, valentinite, kermesite, native antimony and stibnite.[3]
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References
- "Stibiconite". Webminerals. Retrieved 2009-06-06.
- "Stibiconite". Mindat. Retrieved 2009-06-06.
- Handbook of Mineralogy
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